Transcript
LT6233/LT6233-10 LT6234/LT6235 60MHz, Rail-to-Rail Output, 1.9nV/√Hz, 1.2mA Op Amp Family FEATURES n n n n
n n n n n n n
n n
DESCRIPTION
Low Noise Voltage: 1.9nV/√Hz Low Supply Current: 1.2mA/Amp Max Low Offset Voltage: 350µV Max Gain-Bandwidth Product: LT6233: 60MHz; AV ≥ 1 LT6233-10: 375MHz; AV ≥ 10 Wide Supply Range: 3V to 12.6V Output Swings Rail-to-Rail Common Mode Rejection Ratio: 115dB Typ Output Current: 30mA Operating Temperature Range: –40°C to 85°C LT6233 Shutdown to 10µA Maximum LT6233/LT6233-10 in a Low Proile (1mm) ThinSOT™ Package Dual LT6234 in 8-Pin SO and Tiny DFN Packages LT6235 in a 16-Pin SSOP Package
APPLICATIONS n n n n n
Ultrasound Ampliiers Low Noise, Low Power Signal Processing Active Filters Driving A/D Converters Rail-to-Rail Buffer Ampliiers
The LT®6233/LT6234/LT6235 are single/dual/quad low noise, rail-to-rail output unity-gain stable op amps that feature 1.9nV/√Hz noise voltage and draw only 1.2mA of supply current per ampliier. These ampliiers combine very low noise and supply current with a 60MHz gainbandwidth product, a 17V/µs slew rate and are optimized for low supply voltage signal conditioning systems. The LT6233-10 is a single ampliier optimized for higher gain applications resulting in higher gain bandwidth and slew rate. The LT6233 and LT6233-10 include an enable pin that can be used to reduce the supply current to less than 10µA. The ampliier family has an output that swings within 50mV of either supply rail to maximize the signal dynamic range in low supply applications and is speciied on 3.3V, 5V and ±5V supplies. The en • √ISUPPLY product of 2.1 per ampliier is among the most noise eficient of any op amp. The LT6233/LT6233-10 are available in the 6-lead SOT-23 package and the LT6234 dual is available in the 8-pin SO package with standard pinouts. For compact layouts, the dual is also available in a tiny dual ine pitch leadless package (DFN). The LT6235 is available in the 16-pin SSOP package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Noise Voltage and Unbalanced Noise Current vs Frequency
Low Noise Low Power Instrumentation Amplifier 6
R6 499Ω
5
1/2 LT6234 VS+
R2 475Ω
+
R1 49.9Ω
LT6233 R3 475Ω
– R5 499Ω
1/2 LT6234 IN– VS –
VOUT EN
NOISE VOLTAGE (nV/√Hz)
R4 499Ω
IN+
VS = ±2.5V TA = 25°C VCM = 0V
5
4
4
3
3 NOISE VOLTAGE
2
2
1
R7 VS– 499Ω
6
1 NOISE CURRENT
UNBALANCED NOISE CURRENT (pA/√Hz)
VS +
623345 TA01a
0
AV = 20 BW = 2.8MHz VS = ±1.5V to ±5V
IS = 3mA EN = 8µVRMS INPUT REFERRED, MEASUREMENT BW = 4MHz
10
100
1k 10k FREQUENCY (Hz)
0 100k 623345 TA01b
623345fc
1
LT6233/LT6233-10 LT6234/LT6235 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V+ to V–) .............................. 12.6V Input Current (Note 2) ......................................... ±40mA Output Short-Circuit Duration (Note 3) ............ Indeinite Operating Temperature Range (Note 4)....–40°C to 85°C Speciied Temperature Range (Note 5) ....–40°C to 85°C Junction Temperature ........................................... 150°C
Junction Temperature (DD Package) .................... 125°C Storage Temperature Range .................. –65°C to 150°C Storage Temperature Range (DD Package) ........................................ –65°C to 125°C Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION TOP VIEW TOP VIEW OUT 1 V– 2 +IN 3
OUT A
1
6 V+
–IN A
2
5 ENABLE
+IN A
3
V–
4
4 –IN
S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 150°C, θJA = 250°C/W
– +
– +
8
V+
7
OUT B
6
–IN B
5
+IN B
DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 160°C/W UNDERSIDE METAL CONNECTED TO V– (PCB CONNECTION OPTIONAL) TOP VIEW OUT A 1
–IN A 2 +IN A 3 V–
4
– + – +
8
V+
7
OUT B
V
6
–IN B
+IN B 5
+IN B
–IN B 6
5
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJA = 190°C/W
+IN A 3 +
– +
A
–
–IN A 2
OUT A 1
16 D
+
TOP VIEW
4
OUT B 7 NC 8
OUT D
15 –IN D 14 +IN D 13 V
+ –B
+
C–
–
12 +IN C 11 –IN C 10 OUT C 9
NC
GN PACKAGE 16-LEAD NARROW PLASTIC SSOP TJMAX = 150°C, θJA = 135°C/W
623345fc
2
LT6233/LT6233-10 LT6234/LT6235 ORDER INFORMATION LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE
LT6233CS6#PBF
LT6233CS6#TRPBF
LTAFL
6-Lead Plastic TS0T-23
0°C to 70°C
LT6233IS6#PBF
LT6233IS6#TRPBF
LTAFL
6-Lead Plastic TS0T-23
–40°C to 85°C
LT6233CS6-10#PBF
LT6233CS6-10#TRPBF
LTAFM
6-Lead Plastic TS0T-23
0°C to 70°C
LT6233IS6-10#PBF
LT6233IS6-10#TRPBF
LTAFM
6-Lead Plastic TS0T-23
–40°C to 85°C
LT6234CS8#PBF
LT6234CS8#TRPBF
6234
8-Lead Plastic SO
0°C to 70°C
LT6234IS8#PBF
LT6234IS8#TRPBF
6234I
8-Lead Plastic SO
–40°C to 85°C
LT6234CDD#PBF
LT6234CDD#TRPBF
LAET
8-Lead (3mm × 3mm) Plastic DFN
0°C to 70°C
LT6234IDD#PBF
LT6234IDD#TRPBF
LAET
8-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LT6235CGN#PBF
LT6235CGN#TRPBF
6235
16-Lead Narrow Plastic SSOP
0°C to 70°C
LT6235IGN#PBF
LT6235IGN#TRPBF
6235I
16-Lead Narrow Plastic SSOP
–40°C to 85°C
Consult LTC Marketing for parts speciied with wider operating temperature ranges. *The temperature grade is identiied by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based inish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel speciications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS ENABLE = 0V, unless otherwise noted. SYMBOL PARAMETER VOS
IB
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, TYP
MAX
UNITS
100 50 75
500 350 450
µV µV µV
Input Offset Voltage Match (Channel-to-Channel) (Note 6)
80
600
µV
Input Bias Current
1.5
3
µA
Input Offset Voltage
CONDITIONS
MIN
LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD
IB Match (Channel-to-Channel) (Note 6)
0.04
0.3
µA
IOS
Input Offset Current
0.04
0.3
µA
Input Noise Voltage
0.1Hz to 10Hz
220
en
Input Noise Voltage Density
f = 10kHz, VS = 5V
1.9
in
Input Noise Current Density, Balanced Source Input Noise Current Density, Unbalanced Source
f = 10kHz, VS = 5V, RS = 10k f = 10kHz, VS = 5V, RS = 10k
0.43 0.78
Input Resistance
Common Mode Differential Mode
22 25
MΩ kΩ
CIN
Input Capacitance
Common Mode Differential Mode
2.5 4.2
pF pF
AVOL
Large-Signal Gain
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2 VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
73 18
140 35
V/mV V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2
53 11
100 20
V/mV V/mV
nVP-P 3
nV/√Hz pA/√Hz pA/√Hz
VCM
Input Voltage Range
Guaranteed by CMRR, VS = 5V, 0V Guaranteed by CMRR, VS = 3.3V, 0V
CMRR
Common Mode Rejection Ratio
VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V
90 85
115 110
dB dB
CMRR Match (Channel-to-Channel) (Note 6)
VS = 5V, VCM = 1.5V to 4V
84
115
dB
1.5 1.15
4 2.65
V V
623345fc
3
LT6233/LT6233-10 LT6234/LT6235 ELECTRICAL CHARACTERISTICS ENABLE = 0V, unless otherwise noted.
TA = 25°C, VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply,
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
PSRR
Power Supply Rejection Ratio PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
90
115
dB
VS = 3V to 10V
84
115
dB
Minimum Supply Voltage (Note 7)
MAX
3
UNITS
V
VOL
Output Voltage Swing Low (Note 8)
No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 10mA
4 75 165 125
40 180 320 240
mV mV mV mV
VOH
Output Voltage Swing High (Note 8)
No Load ISOURCE = 5mA VS = 5V, ISOURCE = 15mA VS = 3.3V, ISOURCE = 10mA
5 85 220 165
50 195 410 310
mV mV mV mV
ISC
Short-Circuit Current
VS = 5V VS = 3.3V
IS
Supply Current per Ampliier Disabled Supply Current per Ampliier
ENABLE = V+ – 0.35V
1.05 0.2
1.2 10
mA µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
–25
–75
µA
VL
ENABLE Pin Input Voltage Low
0.3
V
10
µA
VH
±40 ±35
±55 ±50
mA mA
V+ – 0.35
ENABLE Pin Input Voltage High
V
Output Leakage Current
ENABLE = V+ – 0.35V, VO = 1.5V to 3.5V
0.2
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
500
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
76
µs
GBW
Gain-Bandwidth Product
Frequency = 1MHz, VS = 5V LT6233-10
55 320
MHz MHz
SR
Slew Rate
VS = 5V, A V = –1, RL = 1k, VO = 1.5V to 3.5V
15
V/µs
80
V/µs
10
LT6233-10, VS = 5V, AV = –10, RL = 1k, VO = 1.5V to 3.5V FPBW tS
Full-Power Bandwidth Settling Time (LT6233, LT6234, LT6235)
1.6
MHz
LT6233-10, HD2 = HD3 ≤ 1%
VS = 5V, VOUT = 3VP-P (Note 9)
1.06
2.2
MHz
0.1%, VS = 5V, VSTEP = 2V, AV = –1, RL = 1k
175
ns
623345fc
4
LT6233/LT6233-10 LT6234/LT6235 ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the 0°C < TA < 70°C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6233CS6, LT6233CS6-10 LT6234CS8, LT6235CGN LT6234CDD
Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC IB
Input Offset Voltage Drift (Note 10)
MIN
TYP
UNIT
600 450 550
µV µV µV
l
800
µV
3.0
µV/°C
0.5
l
Input Bias Current
l
3.5
µA
IB Match (Channel-to-Channel) (Note 6)
l
0.4
µA
IOS
Input Offset Current
AVOL
Large-Signal Gain
VCM
VCM = Half Supply
MAX
l l l
Input Voltage Range
µA
l l
47 12
V/mV V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 l VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2 l
40 7.5
V/mV V/mV
Guaranteed by CMRR VS = 5V, 0V Vs = 3.3V, 0V
l l
1.5 1.15
VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V
l l
90 85
dB dB
l
84
dB
l
90
dB
l
84
dB
l
3
V
CMRR
Common Mode Rejection Ratio
PSRR
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V Power Supply Rejection Ratio VS = 3V to 10V PSRR Match (Channel-to-Channel) (Note 6)
0.4
l
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2 VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
VS = 3V to 10V
Minimum Supply Voltage (Note 7)
4 2.65
V V
VOL
Output Voltage Swing Low (Note 8)
No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 10mA
l l l l
50 195 360 265
mV mV mV mV
VOH
Output Voltage Swing High (Note 8)
No Load ISOURCE = 5mA VS = 5V, ISOURCE = 15mA VS = 3.3V, ISOURCE = 10mA
l l l l
60 205 435 330
mV mV mV mV
ISC
Short-Circuit Current
VS = 5V VS = 3.3V
l l
IS
Supply Current per Ampliier Disabled Supply Current per Ampliier
ENABLE = V+ – 0.25V
l l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
l
VL
ENABLE Pin Input Voltage Low
l
VH
ENABLE Pin Input Voltage High
l
±35 ±30
mA mA 1.45
mA µA
–85
µA
0.3
V
1
V+ – 0.25
V
Output Leakage Current
ENABLE = V+ – 0.25V, VO = 1.5V to 3.5V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
l
500
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
l
120
µs
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
l
FPBW
Full-Power Bandwidth (Note 9)
VS = 5V, VOUT = 3VP-P; LT6233C, LT6234C, LT6235C
9
LT6233-10, AV = –10, RL = 1k, VO = 1.5V to 3.5V l l
V/µs 75
955
V/µs kHz
623345fc
5
LT6233/LT6233-10 LT6234/LT6235 ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the –40°C < TA < 85°C temperature range. VS = 5V, 0V; VS = 3.3V, 0V; VCM = VOUT = half supply, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
LT6233IS6, LT6233IS6-10 LT6234IS8, LT6235IGN LT6234IDD
Input Offset Voltage Match (Channel-to-Channel) (Note 6) VOS TC
Input Offset Voltage Drift (Note 10)
IB
Input Bias Current
VCM = Half Supply
MAX
UNITS
l l l
700 550 650
µV µV µV
l
1000
µV
3
µV/°C
l
4
µA
0.4
µA
0.5
µA
IB Match (Channel-to-Channel) (Note 6) IOS
Input Offset Current
l
AVOL
Large-Signal Gain
CMRR
Input Voltage Range
Common Mode Rejection Ratio
VS = 5V, VO = 0.5V to 4.5V, RL = 10k to VS/2 VS = 5V, VO = 0.5V to 4.5V, RL = 1k to VS/2
l l
45 11
V/mV V/mV
VS = 3.3V, VO = 0.65V to 2.65V, RL = 10k to VS/2 VS = 3.3V, VO = 0.65V to 2.65V, RL = 1k to VS/2
l l
38 7
V/mV V/mV
Guaranteed by CMRR VS = 5V, 0V VS = 3.3V, 0V
l l
1.5 1.15
VS = 5V, VCM = 1.5V to 4V VS = 3.3V, VCM = 1.15V to 2.65V
l l
90 85
dB dB
CMRR Match (Channel-to-Channel) (Note 6) VS = 5V, VCM = 1.5V to 4V PSRR
0.5
l
l
VCM
TYP
4 2.65
V V
l
84
dB
Power Supply Rejection Ratio
VS = 3V to 10V
l
90
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = 3V to 10V
l
84
dB
l
3
Minimum Supply Voltage (Note 7)
V
VOL
Output Voltage Swing Low (Note 8)
No Load ISINK = 5mA VS = 5V, ISINK = 15mA VS = 3.3V, ISINK = 10mA
l l l l
50 195 370 275
mV mV mV mV
VOH
Output Voltage Swing High (Note 6)
No Load ISOURCE = 5mA VS = 5V, ISOURCE = 15mA VS = 3.3V, ISOURCE = 10mA
l l l l
60 210 445 335
mV mV mV mV
ISC
Short-Circuit Current
VS = 5V VS = 3.3V
l l
IS
Supply Current per Ampliier Disabled Supply Current per Ampliier
ENABLE = V+ – 0.2V
l l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
VL
ENABLE Pin Input Voltage Low
VH tON
ENABLE Pin Input Voltage High
mA µA
l
–100
µA
l
0.3
V
l
Output Leakage Current Turn-On Time
ENABLE = 5V to 0V, RL = 1k, VS = 5V
l
1
V+ – 0.2 1
µA
500
ns
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k, VS = 5V
l
SR
Slew Rate
VS = 5V, AV = –1, RL = 1k, VO = 1.5V to 3.5V
l
135 8
LT6233-10, AV = –10, RL = 1k, VO = 1.5V to 3.5V l Full-Power Bandwidth (Note 9)
VS = 5V, VOUT = 3VP-P; LT6233I, LT6234I, LT6235I
V
l
tOFF
FPBW
mA mA 1.5
ENABLE = V+ – 0.2V, V
O = 1.5V to 3.5V
±30 ±20
l
70 848
µs V/µs V/µs kHz
623345fc
6
LT6233/LT6233-10 LT6234/LT6235 ELECTRICAL CHARACTERISTICS
TA = 25°C, VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6233S6, LT6233S6-10 LT6234S8, LT6235GN LT6234DD
IB
MIN
TYP
MAX
UNITS
100 50 75
500 350 450
µV µV µV
Input Offset Voltage Match (Channel-to-Channel) (Note 6)
100
600
µV
Input Bias Current
1.5
3
µA
IB Match (Channel-to-Channel) (Note 6)
0.04
0.3
µA
IOS
Input Offset Current
0.04
0.3
µA
Input Noise Voltage
0.1Hz to 10Hz
220
en
Input Noise Voltage Density
f = 10kHz
1.9
3.0
nV/√Hz
in
Input Noise Current Density, Balanced Source Input Noise Current Density, Unbalanced Source
f = 10kHz, RS = 10k f = 10kHz, RS = 10k
0.43 0.78
Input Resistance
Common Mode Differential Mode
22 25
MΩ kΩ
CIN
Input Capacitance
Common Mode Differential Mode
2.1 3.7
pF pF
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k VO = ±4.5V, RL = 1k
180 55
V/mV V/mV
VCM
Input Voltage Range
Guaranteed by CMRR
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
90
110
dB
97 28
nVP-P pA/√Hz pA/√Hz
4
V
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
84
120
dB
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
90
115
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
84
115
VOL
Output Voltage Swing Low (Note 8)
No Load ISINK = 5mA ISINK = 15mA
4 75 165
40 180 320
mV mV mV
VOH
Output Voltage Swing High (Note 8)
No Load ISOURCE = 5mA ISOURCE = 15mA
5 85 220
50 195 410
mV mV mV
1.4 10
mA µA
–85
µA
ISC
Short-Circuit Current
IS
Supply Current per Ampliier Disabled Supply Current per Ampliier
ENABLE = 4.65V
1.15 0.2
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
–35
±40
dB
±55
VL
ENABLE Pin Input Voltage Low
VH
ENABLE Pin Input Voltage High Output Leakage Current
ENABLE = 4.65V, VO = ±1V
0.2
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
900
mA
0.3 4.65
V V
10
µA ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
100
µs
GBW
Gain-Bandwidth Product
Frequency = 1MHz LT6233-10
42 260
60 375
MHz MHz
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
12
17
V/µs
FPBW
Full-Power Bandwidth
VOUT = 3VP-P (Note 9)
tS
Settling Time (LT6233, LT6234, LT6235)
LT6233-10, AV = –10, RL = 1k, VO = –2V to 2V
115
V/µs
1.8
MHz
LT6233-10, HD2 = HD3 ≤ 1%
2.2
MHz
0.1%, VSTEP = 2V, AV = –1, RL = 1k
170
ns
1.27
623345fc
7
LT6233/LT6233-10 LT6234/LT6235 ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the 0°C < TA < 70°C temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VOS
Input Offset Voltage
LT6233CS6, LT6233CS6-10 LT6234CS8, LT6235CGN LT6234CDD
MAX
UNITS
l l l
600 450 550
µV µV µV
Input Offset Voltage Match (Channel-to-Channel) (Note 6)
l
800
µV
VOS TC
Input Offset Voltage Drift (Note 10)
l
IB
Input Bias Current
l
3.5
µA
IB Match (Channel-to-Channel) (Note 6)
l
0.4
µA
IOS
Input Offset Current
l
0.4
µA
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k VO = ±4.5V, RL = 1k
l l
75 22
VCM
Input Voltage Range
Guaranteed by CMRR
l
–3
CMRR
Common Mode Rejection Ratio
VCM = –3V to 4V
l
90
dB
CMRR Match (Channel-to-Channel) (Note 6)
VCM = –3V to 4V
l
84
dB
PSRR
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
l
90
dB
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
l
84
VOL
Output Voltage Swing Low (Note 8)
No Load ISINK = 5mA ISINK = 15mA
l l l
50 195 360
mV mV mV
VOH
Output Voltage Swing High (Note 8)
No Load ISOURCE = 5mA ISOURCE = 15mA
l l l
60 205 435
mV mV mV
ISC
Short-Circuit Current
l
IS
Supply Current per Ampliier Disabled Supply Current per Ampliier
1.7
ENABLE = 4.75V
l l
mA µA
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
l
–95
µA
VL
ENABLE Pin Input Voltage Low
l
0.3
V
VH
ENABLE Pin Input Voltage High
l
Output Leakage Current
MIN
TYP
0.5
3
µV/°C
V/mV V/mV 4
V
dB
±35
mA 1
4.75
V
ENABLE = 4.75V, VO = ±1V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
l
900
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
l
150
µs
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
l
LT6233-10, AV = –10, RL = 1k, VO = –2V to 2V
l
VOUT = 3VP-P ; LT6233C, LT6234C, LT6235C
l
FPBW
Full-Power Bandwidth (Note 9)
11
V/µs 105
1.16
V/µs MHz
623345fc
8
LT6233/LT6233-10 LT6234/LT6235 ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the –40°C < TA < 85°C temperature range. VS = ±5V, VCM = VOUT = 0V, ENABLE = 0V, unless otherwise noted. (Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
VOS
Input Offset Voltage
LT6233IS6, LT6233IS6-10 LT6234IS8, LT6235IGN LT6234IDD
TYP
MAX
UNITS
l l l
700 550 650
µV µV µV
Input Offset Voltage Match (Channel-to-Channel) (Note 6)
l
1000
µV
VOS TC
Input Offset Voltage Drift (Note 10)
l
3
µV/°C
IB
Input Bias Current
l
4
µA
0.5
IB Match (Channel-to-Channel) (Note 6)
l
0.4
µA
IOS
Input Offset Current
l
0.5
µA
AVOL
Large-Signal Gain
VO = ±4.5V, RL = 10k VO = ±4.5V, RL = 1k
l l
68 20
VCM
Input Voltage Range
Guaranteed by CMRR
l
–3
Common Mode Rejection Ratio
VCM = –3V to 4V
l
90
dB
CMRR Match (Channel-to-Channel) (Note 6) VCM = –3V to 4V
l
84
dB dB
CMRR PSRR
Power Supply Rejection Ratio
VS = ±1.5V to ±5V
l
90 84
V/mV V/mV 4
V
PSRR Match (Channel-to-Channel) (Note 6)
VS = ±1.5V to ±5V
l
VOL
Output Voltage Swing Low (Note 8)
No Load ISINK = 5mA ISINK = 15mA
l l l
50 195 370
mV mV mV
VOH
Output Voltage Swing High (Note 8)
No Load ISOURCE = 5mA ISOURCE = 15mA
l l l
70 210 445
mV mV mV
ISC
Short-Circuit Current
l
IS
Supply Current per Ampliier Disabled Supply Current per Ampliier
ENABLE = 4.8V
l l
IENABLE
ENABLE Pin Current
ENABLE = 0.3V
l
VL
ENABLE Pin Input Voltage Low
l
VH
ENABLE Pin Input Voltage High
l
dB
±30
mA 1.75
mA µA
–110
µA
0.3
V
1
4.8
V
Output Leakage Current
ENABLE = 4.8V, VO = ±1V
l
1
µA
tON
Turn-On Time
ENABLE = 5V to 0V, RL = 1k
l
900
ns
tOFF
Turn-Off Time
ENABLE = 0V to 5V, RL = 1k
l
160
µs
SR
Slew Rate
AV = –1, RL = 1k, VO = –2V to 2V
l
LT6233-10, AV = –10, RL = 1k, VO = –2V to 2V
l
VOUT = 3VP-P; LT6233I, LT6234I, LT6235I
l
FPBW
Full-Power Bandwidth (Note 9)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Inputs are protected by back-to-back diodes. If the differential input voltage exceeds 0.7V, the input current must be limited to less than 40mA. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indeinitely. Note 4: The LT6233C/LT6233I the LT6234C/LT6234I, and LT6235C/LT6235I are guaranteed functional over the temperature range of –40°C to 85°C.
10
V/µs 95
1.06
V/µs MHz
Note 5: The LT6233C/LT6234C/LT6235C are guaranteed to meet speciied performance from 0°C to 70°C. The LT6233C/LT6234C/LT6235C are designed, characterized and expected to meet speciied performance from –40°C to 85°C, but are not tested or QA sampled at these temperatures. The LT6233I/LT6234I/LT6235I are guaranteed to meet speciied performance from –40°C to 85°C. Note 6: Matching parameters are the difference between the two ampliiers A and D and between B and C of the LT6235; between the two ampliiers of the LT6234. CMRR and PSRR match are deined as follows: CMRR and PSRR are measured in µV/V on the matched ampliiers. The difference is calculated between the matching sides in µV/V. The result is converted to dB. 623345fc
9
LT6233/LT6233-10 LT6234/LT6235 ELECTRICAL CHARACTERISTICS Note 7: Minimum supply voltage is guaranteed by power supply rejection ratio test. Note 8: Output voltage swings are measured between the output and power supply rails.
Note 9: Full-power bandwidth is calculated from the slew rate: FPBW = SR/2πVP Note 10: This parameter is not 100% tested.
TYPICAL PERFORMANCE CHARACTERISTICS (LT6233/LT6234/LT6235) Supply Current vs Supply Voltage (Per Amplifier)
VOS Distribution 2.0
60
VS = 5V, 0V VCM = V+/2 50 S8
500 400
40 30 20
VS = 5V, 0V
300
TA = 125°C
1.5
OFFSET VOLTAGE (µV)
SUPPLY CURRENT (mA)
NUMBER OF UNITS
Offset Voltage vs Input Common Mode Voltage
TA = 25°C 1.0 TA = –55°C 0.5
200 100 0 –100 TA = –55°C
–200 –300
10
TA = 25°C
–400 0 50 100 150 200 –200 –150 –100 –50 0 INPUT OFFSET VOLTAGE (µV)
0
2
0
10 12 8 6 TOTAL SUPPLY VOLTAGE (V) 4
Input Bias Current vs Common Mode Voltage
TA = –55°C
2 TA = 125°C TA = 25°C
0
4 3 2
VCM = 4V
1
VCM = 1.5V
0
–1 –2
10
VS = 5V, 0V
5 INPUT BIAS CURRENT (µA)
INPUT BIAS CURRENT (µA)
5
1
–1
0
4 5 3 2 COMMON MODE VOLTAGE (V) 1
Output Saturation Voltage vs Load Current (Output Low) OUTPUT SATURATION VOLTAGE (V)
6
VS = 5V, 0V
3
623345 GO3
Input Bias Current vs Temperature
4
6
623345 GO4
TA = 125°C 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 INPUT COMMON MODE VOLTAGE (V)
623345 GO2
623345 GO1
6
–500
14
–1 –50
1
0
50 75 25 TEMPERATURE (°C)
100
125
623345 GO5
TA = 125°C
0.1
TA = –55°C 0.01 TA = 25°C 0.001
0.0001 –25
VS = 5V, 0V
0.01
10 0.1 1 LOAD CURRENT (mA)
100 623345 GO6
623345fc
10
LT6233/LT6233-10 LT6234/LT6235 TYPICAL PERFORMANCE CHARACTERISTICS (LT6233/LT6234/LT6235) Output Saturation Voltage vs Load Current (Output High) 1.0
80
VCM = VS/2
0.8 0.6
1
TA = 125°C
0.1
TA = –55°C 0.01
0.4 0.2 0 –0.2
TA = –55°C
–0.4 –0.6
TA = 25°C
0.001
–0.8
10 0.1 1 LOAD CURRENT (mA)
0.01
TA = 25°C
–1.0
100
TA = 125°C
2.0
–20
RL = 100Ω
–1.0
0.5
RL = 1k
0
RL = 100Ω
–0.5 –1.0
–0.5
40
VS = ±5V CHANGE IN OFFSET VOLTAGE (µV)
0 –0.5 –1.0 –1.5 –2.0 –90
TA = –55°C
4
100
TA = 25°C
35
VS = ±5V
30 25 VS = ±2.5V
20 15
5
Total Noise vs Total Source Resistance
Warm-Up Drift vs Time
0.5
–5 –4 –3 –2 –1 0 1 2 3 OUTPUT VOLTAGE (V)
623345 G12
TOTAL NOISE (nV/√Hz)
Offset Voltage vs Output Current
1.0
–2.5
623345 G11
623345 G10
TA = 125°C
RL = 100Ω
–1.0
–2.0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 OUTPUT VOLTAGE (V)
RL = 1k
0
–2.5
1.5
VS = ±5V TA = 25°C
0.5
–2.5
3.0
5.0
1.0
–1.5
2.0
2.5 3.0 3.5 4.0 4.5 POWER SUPPLY VOLTAGE (±V)
2.0
1.5
1.0
–2.0 2.5
TA = 25°C
2.0
–1.5
1.0 1.5 2.0 OUTPUT VOLTAGE (V)
TA = –55°C
–60
–2.0 0.5
TA = 125°C
–40
–1.5
0
SOURCING
Open-Loop Gain
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
INPUT VOLTAGE (mV)
RL = 1k
–0.5
0
2.5
1.5
0
TA = 25°C
623345 GO9
VS = 5V, 0V TA = 25°C
2.0
1.5 1.0
TA = 125°C
SINKING
20
Open-Loop Gain 2.5
VS = 3V, 0V TA = 25°C
0.5
40
623345 G08
Open-Loop Gain 2.5
TA = –55°C
60
–80 1.5
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 TOTAL SUPPLY VOLTAGE (V)
623345 G07
OFFSET VOLTAGE (mV)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 5V, 0V
OFFSET VOLTAGE (mV)
OUTPUT SATURATION VOLTAGE (V)
10
Output Short-Circuit Current vs Power Supply Voltage
Minimum Supply Voltage
VS = ±1.5V
VS = ±2.5V VCM = 0V f = 100kHz UNBALANCED SOURCE 10 RESISTORS
TOTAL NOISE
RESISTOR NOISE AMPLIFIER NOISE VOLTAGE
1
10
TA = 25°C –60
–30
0
30
60
90
OUTPUT CURRENT (mA) 623345 G13
0
0
10
30 40 20 TIME AFTER POWER-UP (s)
50 623345 G14
0.1
10
100 1k 10k TOTAL SOURCE RESISTANCE (Ω)
100k
623345 G15
623345fc
11
LT6233/LT6233-10 LT6234/LT6235 TYPICAL PERFORMANCE CHARACTERISTICS (LT6233/LT6234/LT6235) Noise Voltage and Unbalanced Noise Current vs Frequency
4
3
3 NOISE VOLTAGE
2
1
1 NOISE CURRENT
0
100
10
100nV
–100nV
1k 10k FREQUENCY (Hz)
5s/DIV
GAIN (dB)
60
VS = ±5V
40
30
20
20
0 VS = 3V, 0V
10 0
VS = ±5V
–20 –40
GAIN
–10 –20 100k
1M
PHASE (DEG)
VS = 3V, 0V
40
10M 100M FREQUENCY (Hz)
1G
PHASE MARGIN
22
GAIN BANDWIDTH
50 40
–80
30
2
10 12 8 6 TOTAL SUPPLY VOLTAGE (V) 4
AV = 2 AV = 1
1
1M 10M FREQUENCY (Hz)
100M 623345 G22
20 18 16 VS = ±2.5V FALLING
14 VS = ±2.5V RISING
10 –55 –35 –15
14
5 25 45 65 85 105 125 TEMPERATURE (°C) 623345 G21
Common Mode Rejection Ratio vs Frequency
Channel Separation vs Frequency –40
100
CHANNEL SEPARATION (dB)
AV = 10
VS = ±5V FALLING
12 0
125
VS = ±5V RISING
623345 G20
COMMON MODE REJECTION RATIO (dB)
OUTPUT IMPEDANCE (Ω)
60
60
–60
VS = 5V, 0V
0.1 100k
AV = –1 24 RF = RG = 1k
120
10
95
26
70
40
Output Impedance vs Frequency
100
65 35 5 TEMPERATURE (°C)
Slew Rate vs Temperature
50
70
623345 G19
1k
–25
623345 G18
PHASE MARGIN (DEG)
50
VS = 3V, 0V
80
TA = 25°C CL = 5pF RL = 1k GAIN BANDWIDTH (MHz)
CL = 5pF RL = 1k 100 VCM = VS/2 80
PHASE
60
GAIN BANDWIDTH
VS = ±5V
60
Gain Bandwidth and Phase Margin vs Supply Voltage 120
70
40
623345 G17
Open-Loop Gain vs Frequency
50
PHASE MARGIN
CL = 5pF 80 RL = 1k VCM = VS/2 70
40 –55
623345 G16
80
90
50
0 100k
60
VS = 3V, 0V
SLEW RATE (V/µs)
2
VS = ±5V
PHASE MARGIN (DEG)
4
70
GAIN BANDWIDTH (MHz)
5
Gain Bandwidth and Phase Margin vs Temperature
VS = ±2.5V
UNBALANCED NOISE CURRENT (pA/√Hz)
5 NOISE VOLTAGE (nV/√Hz)
6
VS = ±2.5V TA = 25°C VCM = 0V
100nV/DIV
6
0.1Hz to 10Hz Output Voltage Noise
80 60 40 20
100k
–70 –80 –90 –100 –110 –120 –130
VS = 5V, 0V VCM = VS/2
0 10k
AV = 1 –50 TA = 25°C VS = ±5V –60
1M 10M FREQUENCY (Hz)
100M
1G
623345 G23
–140 100k
1M 10M FREQUENCY (Hz)
100M 623345 G24
623345fc
12
LT6233/LT6233-10 LT6234/LT6235 TYPICAL PERFORMANCE CHARACTERISTICS (LT6233/LT6234/LT6235) Power Supply Rejection Ratio vs Frequency
60 40
NEGATIVE SUPPLY
20 0
1k
10k
1M 100k FREQUENCY (Hz)
10M
RS = 10Ω
40 35
25 20 RS = 50Ω RL = 50Ω
15
100 CAPACITIVE LOAD (pF)
400
500Ω
200 1mV
10mV
1mV
10mV
– VOUT
+
250 200
1mV
1mV
10mV
150
100 50
500Ω VIN
300
SETTLING TIME (ns)
SETTLING TIME (ns)
VOUT
10mV
100 –3
–4
–2
–1
1 2 0 OUTPUT STEP (V)
3
50
4
–3
–4
–2
–1 1 2 0 OUTPUT STEP (V)
623345 G28
Distortion vs Frequency
RL = 1k, 3RD
–80
–100 10k
RL = 1k, 2ND
100k 1M FREQUENCY (Hz)
–60 –70
RL = 100Ω, 2ND RL = 100Ω, 3RD
7 6 5 4 V = ±5V 3 T S = 25°C A HD2, HD3 < –40dBc 2 100k 1M 10k FREQUENCY (Hz)
623345 G31
10M
Distortion vs Frequency –30
VS = ±2.5V A =2 –40 VV = 2V P-P OUT
RL = 1k, 3RD
–80 –90
10M
AV = –1
8
623345 G30
VS = ±5V AV = 1 –50 VOUT = 2VP-P
RL = 100Ω, 3RD
–90
4
AV = 2
9
Distortion vs Frequency
DISTORTION (dBc)
DISTORTION (dBc)
–70
3
10
–40
VS = ±2.5V AV = 1 –50 VOUT = 2VP-P
–100 10k
1000 623345 G27
623345 G29
–40
–60 RL = 100Ω, 2ND
100 CAPACITIVE LOAD (pF)
10
Maximum Undistorted Output Signal vs Frequency
VS = ±5V TA = 25°C AV = –1
500Ω
350
–
150
0
1000
Settling Time vs Output Step (Inverting)
VS = ±5V TA = 25°C 350 AV = 1
250
15
623345 G26
400
+
RS = 50Ω RL = 50Ω
20
5
Settling Time vs Output Step (Noninverting)
VIN
25
10
10
RS = 20Ω
30
5
623345 G25
300
35
10
0
100M
RS = 20Ω
30
RS = 10Ω
40 OVERSHOOT (%)
POSITIVE SUPPLY
VS = 5V, 0V 45 AV = 2
DISTORTION (dBc)
80
50
VS = 5V, 0V 45 AV = 1
OUTPUT VOLTAGE SWING (VP-P)
100
Series Output Resistance and Overshoot vs Capacitive Load
50
VS = 5V, 0V TA = 25°C VCM = VS/2 OVERSHOOT (%)
POWER SUPPLY REJECTION RATIO (dB)
120
Series Output Resistance and Overshoot vs Capacitive Load
–50 –60
RL = 1k, 3RD
RL = 100Ω, 2ND RL = 100Ω, 3RD
–70 –80
RL = 1k, 2ND
RL = 1k, 2ND –90
100k 1M FREQUENCY (Hz)
10M 623345 G32
–100 10k
100k 1M FREQUENCY (Hz)
10M 623345 G33
623345fc
13
LT6233/LT6233-10 LT6234/LT6235 TYPICAL PERFORMANCE CHARACTERISTICS (LT6233/LT6234/LT6235) Distortion vs Frequency
Large-Signal Response
Small-Signal Response
–30
RL = 1k, 3RD
2V
–60
RL = 100Ω, 2ND RL = 100Ω, 3RD
–70
50mV/DIV
–50 1V/DIV
DISTORTION (dBc)
VS = ±5V A =2 –40 VV = 2V P-P OUT
0V
0V
–2V
–80
RL = 1k, 2ND
–90 –100 10k
100k 1M FREQUENCY (Hz)
10M
623345 G35
200ns/DIV
VS = ±2.5V AV = –1 RL = 1k
VS = ±2.5V AV = 1 RL = 1k
200ns/DIV
623345 G36
623345 G34
Large-Signal Response
Output Overdrive Recovery
VIN 1V/DIV
0V
VOUT 2V/DIV
2V/DIV
5V
0V
0V
–5V
623345 G37
200ns/DIV
VS = ±5V AV = 1 RL = 1k
VS = ±2.5V AV = 3
200ns/DIV
623345 G38
(LT6233) ENABLE Characteristics Supply Current vs ENABLE Pin Voltage
ENABLE Pin Current vs ENABLE Pin Voltage 35 30
TA = 25°C
ENABLE PIN CURRENT (µA)
SUPPLY CURRENT (mA)
1.2 1.0 TA = –55°C
0.8 0.6 0.4
VS = ±2.5V AV = 1
TA = 25°C
VS = ±2.5V –2.0
0 1.0 –1.0 PIN VOLTAGE (V)
2.0 623345 G39
5V 0V
20 TA = 125°C 15 10 5
0.2 0
25
TA = –55°C
ENABLE
TA = 125°C
ENABLE Pin Response Time
VOUT
1.4
0
–2.0
0 1.0 –1.0 PIN VOLTAGE (V)
2.0
0.5V 0V VS = ±2.5V VIN = 0.5V AV = 1 RL = 1k
200µs/DIV
623345 G41
623345 G40
623345fc
14
LT6233/LT6233-10 LT6234/LT6235 TYPICAL PERFORMANCE CHARACTERISTICS (LT6233-10) Gain Bandwidth and Phase Margin vs Temperature 200 VS = ±5V GAIN BANDWIDTH VS = 3V, 0V
250 200
VS = ±5V
70
PHASE MARGIN
VS = 3V, 0V 75 50 25 TEMPERATURE (°C)
–50 –25
VS = ±2.5V RISING
60
60
40
50
20
0
60 VS = 3V, 0V 40
30
20 VS = 3V, 0V
20 10
0 –20
VS = ±5V
0
–40
–10
TA = 25°C AV = 10 375 CL = 5pF RL = 1k 300
GAIN BANDWIDTH
225 100 PHASE MARGIN 50
–80 1M
10M 100M FREQUENCY (Hz)
1G
0
2
4
8 10 6 TOTAL SUPPLY VOLTAGE (V)
623345 G45
60 40 20
100M
150 100
0
0
0
1G
623345 G48
1000 400 800 600 TOTAL RESISTOR LOAD (Ω) (INCLUDES FEEDBACK R) 623345 G47
200
2nd and 3rd Harmonic Distortion vs Frequency –30
8
VS = ±2.5V A = 10 –40 VV = 2V P-P OUT
7
–50
9 OUTPUT VOLTAGE SWING (VP-P)
COMMON MODE REJECTION RATIO (dB)
80
1M 10M FREQUENCY (Hz)
200
50
10
VS = 5V, 0V VCM = VS/2
100k
250
Maximum Undistorted Output vs Frequency
100
0 10k
12
300
623345 G46
Common Mode Rejection Ratio vs Frequency 120
ASV = ±5V 10 V TA = 25°C RF = 1k RG = 100Ω
350
–60
–20 100k
Gain Bandwidth vs Resistor Load 400
DISTORTION (dBc)
GAIN (dB)
AV = 10 CL = 5pF 100 RL = 1k VCM = VS/2 80
6 5 4 3 2 VS = ±5V TA = 25°C 1 AV = 10 HD2, HD3 ≤ 40dBc 0 100k 1M 10k FREQUENCY (Hz)
10000 623345 G44
450
PHASE (DEG)
GAIN
40
100 1000 CAPACITIVE LOAD (pF)
10
5 25 45 65 85 105 125 TEMPERATURE (°C)
PHASE MARGIN (DEG)
VS = ±5V
50
20
Gain Bandwidth and Phase Margin vs Supply Voltage
GAIN BANDWIDTH (MHz)
60
RS = 50Ω
623345 G43
120
PHASE
30
10
0 –55 –35 –15
Open-Loop Gain and Phase vs Frequency 70
RS = 20Ω
40
VS = ±2.5V FALLING
623345 G42
80
RS = 10Ω
50
100 80
VS = 5V, 0V AV = 10
60
VS = ±5V FALLING
120
40 125
100
0
70
GAIN BANDWIDTH (MHz)
300
PHASE MARGIN (DEG)
GAIN BANDWIDTH (MHz)
350
AV = –10 180 RF = 1k RG = 100Ω 160 VS = ±5V RISING 140
OVERSHOOT (%)
AV = 10
400
SLEW RATE (V/µs)
450
Series Output Resistor and Overshoot vs Capacitive Load
Slew Rate vs Temperature
RL = 100Ω, 3RD
–60
RL = 1k, 3RD RL = 100Ω, 2ND RL = 1k, 2ND
–70 –80 –90
10M 623345 G49
–100 10k
100k 1M FREQUENCY (Hz)
10M 623345 G50
623345fc
15
LT6233/LT6233-10 LT6234/LT6235 TYPICAL PERFORMANCE CHARACTERISTICS (LT6233-10) 2nd and 3rd Harmonic Distortion vs Frequency
Large-Signal Response
Output-Overload Recovery
–30
RL = 100Ω, 2ND
–60
0V
0V
0V
RL = 1k, 3RD
–70 –80 –90
–100 10k
VOUT 2V/DIV
RL = 1k, 2ND
RL = 100Ω, 3RD
VIN 0.5V/DIV
–50
VOUT 2V/DIV
DISTORTION (dBc)
VS = ±5V A = 10 –40 VV = 2V P-P OUT
100k 1M FREQUENCY (Hz)
10M
VS = ±5V AV = 10 RF = 900Ω RG = 100Ω
623345 G52
100ns/DIV
VS = 5V, 0V AV = 10 RF = 900Ω RG = 100Ω
100ns/DIV
623345 G53
623345 G51
Input Referred High Frequency Noise Spectrum
Small-Signal Response
1nV/√Hz/DIV
VOUT 100mV/DIV
10
2.5V
VS = 5V, 0V AV = 10 RF = 900Ω RG = 100Ω
100ns/DIV
623345 G54
0
100kHz
20MHz 2MHz/DIV
623345 G55
623345fc
16
LT6233/LT6233-10 LT6234/LT6235 APPLICATIONS INFORMATION Figure 1 is a simpliied schematic of the LT6233/LT6234/ LT6235, which has a pair of low noise input transistors Q1 and Q2. A simple current mirror Q3/Q4 converts the differential signal to a single-ended output, and these transistors are degenerated to reduce their contribution to the overall noise. Capacitor C1 reduces the unity-cross frequency and improves the frequency stability without degrading the gain bandwidth of the ampliier. Capacitor CM sets the overall ampliier gain bandwidth. The differential drive generator supplies current to transistors Q5 and Q6 that swing the output from rail-to-rail. Input Protection There are back-to-back diodes, D1 and D2 across the + and – inputs of these ampliiers to limit the differential input voltage to ±0.7V. The inputs of the LT6233/LT6234/LT6235 do not have internal resistors in series with the input transistors. This technique is often used to protect the input devices from overvoltage that causes excessive current to low. The addition of these resistors would signiicantly degrade the low noise voltage of these ampliiers. For instance, a 100Ω resistor in series with each input would generate 1.8nV/√Hz of noise, and the total ampliier noise voltage would rise from 1.9nV/√Hz to 2.6nV/√Hz. Once the input differential voltage exceeds ±0.7V, steady-state current conducted through the protection diodes should
be limited to ±40mA. This implies 25Ω of protection resistance is necessary per volt of overdrive beyond ±0.7V. These input diodes are rugged enough to handle transient currents due to ampliier slew rate overdrive and clipping without protection resistors. The photo of Figure 2 shows the output response to an input overdrive with the ampliier connected as a voltage follower. With the input signal low, current source I1 saturates and the differential drive generator drives Q6 into saturation so the output voltage swings all the way to V–. The input can swing positive until transistor Q2 saturates into current mirror Q3/Q4. When saturation occurs, the output tries to phase invert, but diode D2 conducts current from the signal source to the output through the feedback connection. The output is clamped a diode drop below the input. In this photo, the input signal generator is limiting at about 20mA.
2.5V
1V/DIV
Amplifier Characteristics
0V
–2.5V
500µs/DIV
623345 F02
Figure 2. VS = ±2.5V, AV = 1 with Large Overdrive
+V +V Q5 Q3 –V
+V
DESD1
Q4
CM
DESD5 VOUT
C1 DESD2
DIFFERENTIAL DRIVE GENERATOR
–V Q1
–VIN D1
DESD6 –V
Q2 Q6
D2
+V
+VIN DESD3
DESD4 –V
I1
BIAS
ENABLE
+V
–V 623345 F01
Figure 1. Simplified Schematic 623345fc
17
LT6233/LT6233-10 LT6234/LT6235 APPLICATIONS INFORMATION With the ampliier connected in a gain of AV ≥ 2, the output can invert with very heavy overdrive. To avoid this inversion, limit the input overdrive to 0.5V beyond the power supply rails. ESD The LT6233/LT6234/LT6235 have reverse-biased ESD protection diodes on all inputs and outputs as shown in Figure 1. If these pins are forced beyond either supply, unlimited current will low through these diodes. If the current is transient and limited to one hundred milliamps or less, no damage to the device will occur. Noise The noise voltage of the LT6233/LT6234/LT6235 is equivalent to that of a 225Ω resistor, and for the lowest possible noise it is desirable to keep the source and feedback resistance at or below this value, i.e., RS + RG||RFB ≤ 225Ω. With RS + RG||RFB = 225Ω the total noise of the ampliier is: eN = √(1.9nV)2 + (1.9nV)2 = 2.69nV/√Hz Below this resistance value, the ampliier dominates the noise, but in the region between 225Ω and about 30k, the noise is dominated by the resistor thermal noise. As the total resistance is further increased beyond 30k, the ampliier noise current multiplied by the total resistance eventually dominates the noise.
The product of eN • √ISUPPLY is an interesting way to gauge low noise ampliiers. Most low noise ampliiers with low eN have high ISUPPLY current. In applications that require low noise voltage with the lowest possible supply current, this product can prove to be enlightening. The LT6233/LT6234/LT6235 have an eN • √ISUPPLY product of only 2.1 per ampliier, yet it is common to see ampliiers with similar noise speciications to have eN • √ISUPPLY as high as 13.5. For a complete discussion of ampliier noise, see the LT1028 data sheet. Enable Pin The LT6233 and LT6233-10 include an ENABLE pin that shuts down the ampliier to 10µA maximum supply current. The ENABLE pin must be driven low to operate the ampliier with normal supply current. The ENABLE pin must be driven high to within 0.35V of V+ to shut down the supply current. This can be accomplished with simple gate logic; however care must be taken if the logic and the LT6233 operate from different supplies. If this is the case, then open-drain logic can be used with a pull-up resistor to ensure that the ampliier remains off. See Typical Performance Characteristics. The output leakage current when disabled is very low; however, current can low into the input protection diodes D1 and D2 if the output voltage exceeds the input voltage by a diode drop.
623345fc
18
LT6233/LT6233-10 LT6234/LT6235 TYPICAL APPLICATIONS Single Supply, Low Noise, Low Power, Bandpass Filter with Gain = 10
R1 732Ω
Frequency Response Plot of Bandpass Filter
C2 47pF f0 =
V+
23
1 = 1MHz 2πRC
C = √C1,C2 R = R1 = R2 R2 732Ω
(
0.1µF
R3 10k
–
VIN
LT6233
+ C3 0.1µF
VOUT
EN
R4 10k
)
f0 = 732Ω MHz, MAXIMUM f0 = 1MHz R f–3dB = f0 2.5 AV = 20dB at f0 EN = 6µVRMS INPUT REFERRED IS = 1.5mA FOR V+ = 5V
GAIN (dB)
C1 1000pF
3
623345 F03
–7 100k
1M FREQUENCY (Hz)
10M 623345 F04
Low Power, Low Noise, Single Supply, Instrumentation Amplifier with Gain = 100
R1 30.9Ω
C2 2200pF
R2 V+ 511Ω C8 68pF
–
U1 LT6233-10
+
VIN1
EN
R15 88.7Ω
C1 1µF
R13 2k
–
R6 511Ω R3 30.9Ω
R5 511Ω
R4 V+ 511Ω
U2 LT6233-10
+
VIN2 C3 1µF
EN
U3 LT6233
+
R16 88.7Ω
R12 511Ω R14 2k
–
V+
R10 511Ω
VOUT
EN
C9 68pF
C4 10µF VOUT = 100 (VIN2 – VIN1)
(
)( )
GAIN = R2 + 1 R1
R10 R15
INPUT RESISTANCE = R5 = R6 f–3dB = 310Hz TO 2.5MHz EN = 10µVRMS INPUT REFERRED IS = 4.7mA FOR VS = 5V, 0V
R1 = R3 R2 = R4 R10 = R12 R15 = R16
623345 F05
623345fc
19
LT6233/LT6233-10 LT6234/LT6235 PACKAGE DESCRIPTION S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX
2.90 BSC (NOTE 4)
0.95 REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75 (NOTE 4) PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR
0.30 – 0.45 6 PLCS (NOTE 3)
0.95 BSC 0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20 (NOTE 3)
NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
1.90 BSC S6 TSOT-23 0302
623345fc
20
LT6233/LT6233-10 LT6234/LT6235 PACKAGE DESCRIPTION DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698 Rev C)
0.70 ±0.05
3.5 ±0.05 1.65 ±0.05 2.10 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05
0.50 BSC 2.38 ±0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
3.00 ±0.10 (4 SIDES)
R = 0.125 TYP 5
0.40 ± 0.10 8
1.65 ± 0.10 (2 SIDES)
PIN 1 TOP MARK (NOTE 6) (DD8) DFN 0509 REV C
0.200 REF
0.75 ±0.05
4 0.25 ± 0.05
1 0.50 BSC
2.38 ±0.10 0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE
623345fc
21
LT6233/LT6233-10 LT6234/LT6235 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3
.045 ±.005
.050 BSC
7
8
.245 MIN
5
6
.160 ±.005
.150 – .157 (3.810 – 3.988) NOTE 3
.228 – .244 (5.791 – 6.197)
.030 ±.005 TYP
1
RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508)
3
2
4
.053 – .069 (1.346 – 1.752)
.008 – .010 (0.203 – 0.254)
.004 – .010 (0.101 – 0.254)
0°– 8° TYP
.016 – .050 (0.406 – 1.270)
.050 (1.270) BSC
.014 – .019 (0.355 – 0.483) TYP
NOTE: 1. DIMENSIONS IN
INCHES (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
GN Package 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) .189 – .196* (4.801 – 4.978)
.045 ±.005
16 15 14 13 12 11 10 9 .254 MIN
.009 (0.229) REF
.150 – .165
.229 – .244 (5.817 – 6.198) .0165 ±.0015
.150 – .157** (3.810 – 3.988)
.0250 BSC
RECOMMENDED SOLDER PAD LAYOUT
1 .015 ± .004 × 45° (0.38 ± 0.10) .007 – .0098 (0.178 – 0.249)
.0532 – .0688 (1.35 – 1.75)
2 3
4
5 6
7
8 .004 – .0098 (0.102 – 0.249)
0° – 8° TYP
.016 – .050 (0.406 – 1.270) NOTE: 1. CONTROLLING DIMENSION: INCHES INCHES 2. DIMENSIONS ARE IN (MILLIMETERS)
.008 – .012 (0.203 – 0.305) TYP
.0250 (0.635) BSC
GN16 (SSOP) 0204
3. DRAWING NOT TO SCALE *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 623345fc
22
LT6233/LT6233-10 LT6234/LT6235 REVISION HISTORY
(Revision history begins at Rev C)
REV
DATE
DESCRIPTION
PAGE NUMBER
C
1/11
Revised y-axis lable on curve G40 in Typical Performance Characteristics
14
Updated ENABLE Pin section in Applications Information
18
623345fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
23
LT6233/LT6233-10 LT6234/LT6235 TYPICAL APPLICATIONS The LT6233 is applied as a transimpedance ampliier with an I-to-V conversion gain of 10k set by R1. The LT6233 is ideally suited to this application because of its low input offset voltage and current, and its low noise. This is because the 10k resistor has an inherent thermal noise of 13nV/√Hz or 1.3pA/√Hz at room temperature, while the LT6233 contributes only 2nV and 0.8pA/√Hz. So, with respect to both voltage and current noises, the LT6233 is actually quieter than the gain resistor. The circuit uses an avalanche photodiode with the cathode biased to approximately 200V. When light is incident on
the photodiode, it induces a current IPD which lows into the ampliier circuit. The ampliier output falls negative to maintain balance at its inputs. The transfer function is therefore VOUT = –IPD • 10k. C1 ensures stability and good settling characteristics. Output offset was measured at better than 500µV, so low in part because R2 serves to cancel the DC effects of bias current. Output noise was measured at below 1mVP-P on a 20MHz measurement bandwidth, with C2 shunting R2’s thermal noise. As shown in the scope photo, the rise time is 45ns, indicating a signal bandwidth of 7.8MHz.
Low Power Avalanche Photodiode Transimpedance Amplifier IS = 1.2mA ≈ 200V BIAS
C1 2.7pF
WWW.ADVANCEDPHOTONIX.COM
50mV/DIV
ADVANCED PHOTONIX 012-70-62-541 R1 10k 5V
– R2 10k
Photodiode Amplifier Time Domain Response
LT6233
+
–5V
100ns/DIV
623345 TA02b
ENABLE 623345 TA02a
C2 0.1µF
OUTPUT OFFSET = 500µV TYPICAL BANDWIDTH = 7.8MHz OUTPUT NOISE = 1mVP-P (20MHz MEASUREMENT BW)
RELATED PARTS PART NUMBER
DESCRIPTION
COMMENTS
LT1028
Single, Ultralow Noise 50MHz Op Amp
0.85nV/√Hz
LT1677
Single, Low Noise Rail-to-Rail Ampliier
3V Operation, 2.5mA, 4.5nV/√Hz, 60µV Max VOS
LT1806/LT1807
Single/Dual, Low Noise 325MHz Rail-to-Rail Ampliier
2.5V Operation, 550µV Max VOS, 3.5nV/√Hz
LT6200/LT6201
Single/Dual, Low Noise 165MHz
0.95nV√Hz, Rail-to-Rail Input and Output
LT6202/LT6203/LT6204
Single/Dual/Quad, Low Noise, Rail-to-Rail Ampliier
1.9nV/√Hz, 3mA Max, 100MHz Gain Bandwidth
623345fc
24 Linear Technology Corporation
LT 0111 REV C • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2003
